Improvement in guides for the stems of stamp-mills



2 Sheets-Sheet 1,

F. P. PIOKINGQ de r the Stem of Stamp-Mill.

5R3. Pate nted July 2,1878.

FIE E7 Ynyenfor 2 Sheets-Sheet 2.

F P. PIOKING. Guide for the Stem of Stamp-Mill.

Patented July 2, 1878.

Inventor 9??? -%V%%y Witne s s e 8- aa %Z/ @w NPTERS. PHO HER.WASHINGTON D O UNITED STATES PATENT OEEIoE.

FRANKLIN P. PIGKING, OF PIOOHE, NEVADA.

IMPROVEMENT IN GUIDES FOR THE STEMS OF STAMP-MILLS.

Specification forming part of Letters Patent No. 205,573, dated July 2,1878; application filed April 22, 1878.

To all whom it may concern.-

Be it known that I, F. P. PIOKING, of Pioche, county of Lincoln, Stateof Nevada, have in vented an Improved Guide for Quartz-Mill Stamp-Stems;and I do hereby declare the following to be a full, clear, and exactdescription thereof, reference being had to the accompanyin g drawings.

My invention relates to improvements in girt-timbers or guide-frames ofquartz-mills, which keep the stems carrying the stamps in position,allowing them a vertical but no latral motion.

It consists in forming a metal back plate which bolts to thegirt-timber, in or on which are formed dovetail mortises, and a metalbox, formed square and tapering, having on one edge a dovetail tenon tofit in the mortises in the back plate. In this metal box is a woodenlining or bushing, made also tapering, which is formed in twolongitudinal halves, each half having a semicircular groove cutlengthwise down its inner face, so that when they are in position in thetapering box the two grooves in the halves form a circular hole, throughwhich the stamp-stem plays.

Figure l is a perspective view of a stampmill. Figs. 2, 3, 4, and 5 areenlarged views of my invention.

Let A represent the frame of a quartz-mill, in which B are thegirt-timbers or guideframes, serving as guides for the stamp-stems O,keeping them in avertical position over the battery D, and admitting ofavertical motion to the stamps.

To the girt-timbers B is fastened, by means of a flange, E, and thenecessary bolts, a metal back plate, F, having dovetailed mortises G,formed either by projecting lugs or by sinking in the body of the plate.lthen construct a metal box or holder, H, having formed on one edge atenon to fit the dovetail mortises in the back plate, so that the boxstands vertically when in position for use. This box or holder H is madesquare, with the opening cut tapering; or it may be made in anydesirable form, the recess being cut tapering for the purpose belowdescribed.

In the tapering hole in the box H, which I preferably make square, isfitted a hard-wood bushing or lining, I, made in two pieces for itseasier insertion, withdrawal, and convenience of manufacture. In thisbushing or lining I to the box H the stamp-stem 0 moves verticallythrough the cylindrical hole J formed in the bushing.

The tapering form of the interior of the box H prevents the bushing orlining I, which, as stated, is also made tapering, from sliding downfarther than its shape admits, and holds it firmly in place.

Through the side of the box H is a slot, in which is fitted a key, K,which passes through the box, and a notch, L, cut in the two pieces ofwood forming the inside lining or bushing I. This key then serves tokeep the lining or bushing from sliding upward out of its seat in thebushing by the upward motion of the stamp-stem.

The two pieces forming the lining I are made of hard wood, cut so thatthe grain is' vertical. A lining made in this manner is easily andquickly removed by taking out the key K, and a slight tap from belowwill loosen the bushing.

When the hole J becomes enlarged by the continued friction of thestamp-stem, the bushing may be taken out, and by removing a little woodfrom each inner side of the halves forming the bushing, and inclosin gthe stampstem by dropping one-half on each side into its seat in the boxH, the wear is taken up.

I thus provide a simple, cheap, and effective appliance through whichthe stems of a stampbattery may play. There are no bolts or fasteningsto be removed, and the bushing may be removed and replaced in a momentwithout the aid of any tools.

In case of anecessity for removing the stampstem, the box holding thebushing may be taken from its dovetailed seat by sliding it up theste1n,\vhere it may remain or it may be slid off altogether.

The back plate and box may be made of steel, so as to be light andstrong. The hardwood bushing will last a long time, and may easily beremoved and replaced when considered necessary.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. The plate F, with its flange E and the dovetailed mortises G, incombination with In witness whereof I hereunto set my hand the holder orbox H, substantially as shown, and seal. and for the purpose hereindescribed. FRANKLIN PIE RCE PICKING 2. The metal box or holder H, madetapering, in combination with the tapering wooden Witnesses: bushing Iand the locking-key K, substantially A. A. YOUNG, as shown and for thepurposeherein described. E. D. TURNER.

